The Cold CEO's Little Sweetheart

The genius hacker Gu Chu was reincarnated into the world of a tragic romance novel as a cute five-year old girl. Her mother is the doomed heroine who will suffer a bad ending. Her father is an arrogant corporate CEO who is oblivious to their troubles. They are surrounded by scheming relatives, like the two-faced auntie and many other conspirators. So it's up to Gu Chu to stand up for her mother. Nobody would suspect a five-year old child? She's just trying to protect her mother, while fighting for a billion-dollar inheritance.

(Source: Kuaikan, translated)